package org.codeblue.support.db;


import java.sql.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class GenEntityMysql {

    private String packageOutPath = "com.user.entity";//指定实体生成所在包的路径
    private String authorName = "封狼居胥";//作者名字
    private String tablename = "user";//表名
    private String[] colnames; // 列名数组
    private String[] colTypes; //列名类型数组
    private int[] colSizes; //列名大小数组
    private boolean f_util = false; // 是否需要导入包java.util.*
    private boolean f_sql = false;  // 是否需要导入包java.sql.*

    //数据库连接
    private static final String URL = "jdbc:mysql://10.34.41.243:3306/wxculture2";
    private static final String NAME = "root";
    private static final String PASS = "Welcome123";
    private static final String DRIVER = "com.mysql.jdbc.Driver";


    public static List getAllTableNames(Connection conn, String user, String database) {
        List tableNames = new ArrayList();
        if (conn != null) {
            try {
                DatabaseMetaData metaData = conn.getMetaData();
                // 表名列表
                ResultSet rest = metaData.getTables(conn.getCatalog(), "root", null, new String[]{"TABLE"});
                // 输出 table_name
                while (rest.next()) {
                    System.out.println(rest.getString("TABLE_NAME"));

                    String tableSchem = rest.getString("TABLE_SCHEM");
                    if (user.equalsIgnoreCase(tableSchem)) {
                        tableNames.add(rest.getString("TABLE_NAME"));
                    }
                }



                String sql = "SELECT  column_name as field, data_type as type, column_comment as memo,is_nullable as isNullable  FROM Information_schema.columns WHERE  table_Name = 'tuser'" ;
                PreparedStatement ps = conn.prepareStatement(sql);
                ResultSet rs = ps.executeQuery(sql);
                while (rs.next()) {

                    String f = rs.getString("field");
                    System.out.println(f);
                }

            } catch (SQLException e) {
                e.printStackTrace();
            }

        }



        return tableNames;
    }

    /*
     * 构造函数
     */
//    public GenEntityMysql() {
//
//        //创建连接
//        Connection con;
//        //查要生成实体类的表
//        String sql = "select * from " + tablename;
//        PreparedStatement pStemt = null;
//        try {
//            try {
//                Class.forName(DRIVER);
//            } catch (ClassNotFoundException e1) {
//                // TODO Auto-generated catch block
//                e1.printStackTrace();
//            }
//            con = DriverManager.getConnection(URL, NAME, PASS);
//            DatabaseMetaData dbmd = con.getMetaData();
//            // 表名列表
//            ResultSet rest = dbmd.getTables( , null, null, new String[] { "TABLE" });
//            // 输出 table_name
//            while (rest.next()) {
//                String tableSchem = rest.getString("TABLE_SCHEM");
//                if (user.equalsIgnoreCase(tableSchem)) {
//                    tableNames.add(rest.getString("TABLE_NAME"));
//                }
//
//
//                int size = rsmd.getColumnCount();    //统计列
//            colnames = new String[size];
//            colTypes = new String[size];
//            colSizes = new int[size];
//            for (int i = 0; i < size; i++) {
//                colnames[i] = rsmd.getColumnName(i + 1);
//                colTypes[i] = rsmd.getColumnTypeName(i + 1);
//
//                if (colTypes[i].equalsIgnoreCase("datetime")) {
//                    f_util = true;
//                }
//                if (colTypes[i].equalsIgnoreCase("image") || colTypes[i].equalsIgnoreCase("text")) {
//                    f_sql = true;
//                }
//                colSizes[i] = rsmd.getColumnDisplaySize(i + 1);
//            }
//
//            String content = parse(colnames, colTypes, colSizes);
//
//            try {
//                File directory = new File("");
//                //System.out.println("绝对路径："+directory.getAbsolutePath());
//                //System.out.println("相对路径："+directory.getCanonicalPath());
//                String path = this.getClass().getResource("").getPath();
//
//                System.out.println(path);
//                System.out.println("src/?/" + path.substring(path.lastIndexOf("/com/", path.length())));
////				String outputPath = directory.getAbsolutePath()+ "/src/"+path.substring(path.lastIndexOf("/com/", path.length()), path.length()) + initcap(tablename) + ".java";
//                String outputPath = directory.getAbsolutePath() + "/src/" + this.packageOutPath.replace(".", "/") + "/" + initcap(tablename) + ".java";
//                FileWriter fw = new FileWriter(outputPath);
//                PrintWriter pw = new PrintWriter(fw);
//                pw.println(content);
//                pw.flush();
//                pw.close();
//            } catch (IOException e) {
//                e.printStackTrace();
//            }
//
//        } catch (SQLException e) {
//            e.printStackTrace();
//        } finally {
////			try {
////				con.close();
////			} catch (SQLException e) {
////				// TODO Auto-generated catch block
////				e.printStackTrace();
////			}
//        }
//    }

    /**
     * 功能：生成实体类主体代码
     *
     * @param colnames
     * @param colTypes
     * @param colSizes
     * @return
     */
    private String parse(String[] colnames, String[] colTypes, int[] colSizes) {
        StringBuffer sb = new StringBuffer();

        //判断是否导入工具包
        if (f_util) {
            sb.append("import java.util.Date;\r\n");
        }
        if (f_sql) {
            sb.append("import java.sql.*;\r\n");
        }
        sb.append("package " + this.packageOutPath + ";\r\n");
        sb.append("\r\n");
        //注释部分
        sb.append("   /**\r\n");
        sb.append("    * " + tablename + " 实体类\r\n");
        sb.append("    * " + new Date() + " " + this.authorName + "\r\n");
        sb.append("    */ \r\n");
        //实体部分
        sb.append("\r\n\r\npublic class " + initcap(tablename) + "{\r\n");
        processAllAttrs(sb);//属性
        processAllMethod(sb);//get set方法
        sb.append("}\r\n");

        //System.out.println(sb.toString());
        return sb.toString();
    }

    /**
     * 功能：生成所有属性
     *
     * @param sb
     */
    private void processAllAttrs(StringBuffer sb) {

        for (int i = 0; i < colnames.length; i++) {
            sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " " + colnames[i] + ";\r\n");
        }

    }

    /**
     * 功能：生成所有方法
     *
     * @param sb
     */
    private void processAllMethod(StringBuffer sb) {

        for (int i = 0; i < colnames.length; i++) {
            sb.append("\tpublic void set" + initcap(colnames[i]) + "(" + sqlType2JavaType(colTypes[i]) + " " +
                    colnames[i] + "){\r\n");
            sb.append("\tthis." + colnames[i] + "=" + colnames[i] + ";\r\n");
            sb.append("\t}\r\n");
            sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get" + initcap(colnames[i]) + "(){\r\n");
            sb.append("\t\treturn " + colnames[i] + ";\r\n");
            sb.append("\t}\r\n");
        }

    }

    /**
     * 功能：将输入字符串的首字母改成大写
     *
     * @param str
     * @return
     */
    private String initcap(String str) {

        char[] ch = str.toCharArray();
        if (ch[0] >= 'a' && ch[0] <= 'z') {
            ch[0] = (char) (ch[0] - 32);
        }

        return new String(ch);
    }

    /**
     * 功能：获得列的数据类型
     * @param sqlType
     * @return
     */
    private String sqlType2JavaType(String sqlType) {

        if (sqlType.equalsIgnoreCase("bit")) {
            return "boolean";
        } else if (sqlType.equalsIgnoreCase("tinyint")) {
            return "byte";
        } else if (sqlType.equalsIgnoreCase("smallint")) {
            return "short";
        } else if (sqlType.equalsIgnoreCase("int")) {
            return "int";
        } else if (sqlType.equalsIgnoreCase("bigint")) {
            return "long";
        } else if (sqlType.equalsIgnoreCase("float")) {
            return "float";
        } else if (sqlType.equalsIgnoreCase("decimal") || sqlType.equalsIgnoreCase("numeric")
                || sqlType.equalsIgnoreCase("real") || sqlType.equalsIgnoreCase("money")
                || sqlType.equalsIgnoreCase("smallmoney")) {
            return "double";
        } else if (sqlType.equalsIgnoreCase("varchar") || sqlType.equalsIgnoreCase("char")
                || sqlType.equalsIgnoreCase("nvarchar") || sqlType.equalsIgnoreCase("nchar")
                || sqlType.equalsIgnoreCase("text")) {
            return "String";
        } else if (sqlType.equalsIgnoreCase("datetime")) {
            return "Date";
        } else if (sqlType.equalsIgnoreCase("image")) {
            return "Blod";
        }

        return null;
    }

    /**
     * 出口
     * TODO
     * @param args
     */
    public static void main(String[] args) throws SQLException {
      //   new GenEntityMysql();
        Connection  con = DriverManager.getConnection(URL, NAME, PASS);
        getAllTableNames(con,"root","wxculture2");
    }

}